Research on the elk lungworm, Dictyocaulus sp. was conducted briefly during January, May, and July of 1973. Project Number 156.
Bergstrom, Robert C.
"Parasites of Ungulates in the Jackson Hole Area (Lungworms in Elk),"
Jackson Hole Research Station Annual Report: Vol. 1973
, Article 5.
Available at: http://repository.uwyo.edu/jhrs_reports/vol1973/iss1/5